:root{
  --color-bg: #f6f7fb;
  --color-surface: #ffffff;
  --color-border: #e5e7ee;
  --color-text: #1f2330;
  --color-muted: #6b7180;
  --color-accent: #5a8df0;
  --color-accent-strong: #3a6cd1;
  --color-chip-bg: #f0f2f8;
  --color-chip-active: #5a8df0;
  --color-chip-active-text: #ffffff;
  --shadow-card: 0 2px 8px rgba(20, 28, 60, .06);
  --shadow-hover: 0 6px 20px rgba(20, 28, 60, .12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --gap: 14px;
  --header-h: 64px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

body{
  background: var(--color-bg);
  color: var(--color-text);
}

.container{
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner{
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
}
.brand{
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-weight: 800;
  letter-spacing: .5px;
}
.brand-mark{
  font-size: 20px;
  background: linear-gradient(135deg,#5a8df0,#a06bff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand-text{ color: var(--color-text); font-size: 16px; }

.category-nav{
  flex: 1;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.category-nav button{
  padding: 6px 14px;
  border-radius: 999px;
  color: var(--color-muted);
  white-space: nowrap;
  transition: background .2s, color .2s;
}
.category-nav button:hover{ color: var(--color-text); background: var(--color-chip-bg); }
.category-nav button.active{
  color: #fff;
  background: var(--color-accent);
}

.search-box{
  position: relative;
  width: 240px;
}
.search-box input{
  width: 100%;
  padding: 8px 30px 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.search-box input:focus{
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(90,141,240,.18);
}
#search-clear{
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 22px; height: 22px;
  border-radius: 50%;
  color: var(--color-muted);
  display: none;
  align-items: center;
  justify-content: center;
}
#search-clear.show{ display: inline-flex; }
#search-clear:hover{ background: var(--color-chip-bg); color: var(--color-text); }

/* ===== Layout ===== */
.main-content{
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  padding: 24px 20px 40px;
}
@media (max-width: 900px){
  .main-content{ grid-template-columns: 1fr; }
  .filters{ position: static !important; }
}

/* ===== Filters ===== */
.filters{
  position: sticky;
  top: calc(var(--header-h) + 16px);
  align-self: start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-card);
  max-height: calc(100vh - var(--header-h) - 32px);
  overflow-y: auto;
}
.filter-block + .filter-block{ margin-top: 18px; }
.filter-title{
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: .5px;
  margin-bottom: 8px;
}
.chip-group{ display: flex; flex-wrap: wrap; gap: 6px; }
.chip{
  padding: 4px 10px;
  font-size: 13px;
  background: var(--color-chip-bg);
  border-radius: 999px;
  color: var(--color-text);
  transition: background .2s, color .2s, transform .1s;
  user-select: none;
}
.chip:hover{ transform: translateY(-1px); }
.chip.active{
  background: var(--color-chip-active);
  color: var(--color-chip-active-text);
}
.color-chips .chip{
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.color-chips .chip::before{
  content: "";
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c, #ccc);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.08);
}
.reset-btn{
  margin-top: 18px;
  width: 100%;
  padding: 8px 0;
  border-radius: var(--radius-sm);
  background: var(--color-chip-bg);
  color: var(--color-muted);
  transition: background .2s, color .2s;
}
.reset-btn:hover{ background: var(--color-accent); color: #fff; }

/* ===== Gallery ===== */
.gallery-toolbar{
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  font-size: 13px;
  color: var(--color-muted);
}
.active-filters{ display: flex; flex-wrap: wrap; gap: 6px; }
.active-filters .pill{
  padding: 2px 8px;
  background: var(--color-chip-bg);
  border-radius: 999px;
}

.gallery{
  column-count: 5;
  column-gap: var(--gap);
}
@media (min-width: 1600px){ .gallery{ column-count: 6; } }
@media (min-width: 2000px){ .gallery{ column-count: 7; } }
@media (min-width: 2400px){ .gallery{ column-count: 8; } }
@media (max-width: 1400px){ .gallery{ column-count: 4; } }
@media (max-width: 1100px){ .gallery{ column-count: 3; } }
@media (max-width: 768px){ .gallery{ column-count: 2; } }
@media (max-width: 480px){ .gallery{ column-count: 1; } }

.card{
  break-inside: avoid;
  margin-bottom: var(--gap);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  transition: transform .2s, box-shadow .2s;
  cursor: zoom-in;
  position: relative;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}
.card-img{
  width: 100%;
  height: auto;
  background: #eef0f6;
  display: block;
  transition: filter .3s;
}
.card-img.loading{ filter: blur(8px); }
.card.is-transparent .card-img{
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #e9ecf2 25%, transparent 25%),
    linear-gradient(-45deg, #e9ecf2 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e9ecf2 75%),
    linear-gradient(-45deg, transparent 75%, #e9ecf2 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.card-badge{
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 11px;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(0,0,0,.6);
  color: #fff;
  letter-spacing: .5px;
  pointer-events: none;
  z-index: 1;
}
.card-badge.transparent{
  background: linear-gradient(135deg, #4ec3ad, #3a72e8);
}
.card-action{
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 0;
  border-radius: 999px;
  background: rgba(20,24,32,.78);
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .5px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  opacity: .85;
  transform: translateY(0);
  transition: opacity .18s, transform .12s, background .18s, box-shadow .18s;
  z-index: 2;
}
.card-action svg{ flex-shrink: 0; }
.card-action svg, .card-action span{ pointer-events: none; }
.card-action:hover{
  background: linear-gradient(135deg, #4ec3ad, #3a72e8);
  opacity: 1;
  box-shadow: 0 4px 14px rgba(58,114,232,.35);
}
.card-action:active{ transform: translateY(1px) scale(.97); }
.card-action:focus-visible{ outline: 2px solid #fff; outline-offset: 2px; }
.card:hover .card-action,
.card:focus-within .card-action{ opacity: 1; }

.toast{
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 20px);
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(20,24,32,.92);
  color: #fff;
  font-size: 13px;
  letter-spacing: .5px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  z-index: 9999;
}
.toast.show{ opacity: 1; transform: translate(-50%, 0); }
.toast[data-type="error"]{ background: rgba(192, 60, 60, .94); }
.card-overlay{
  position: absolute;
  inset: auto 0 0 0;
  padding: 10px 12px;
  background: linear-gradient(to top, rgba(0,0,0,.65), transparent);
  color: #fff;
  opacity: 0;
  transition: opacity .2s;
}
.card:hover .card-overlay{ opacity: 1; }
.card-title{ font-size: 14px; font-weight: 600; }
.card-tags{ font-size: 12px; opacity: .9; margin-top: 2px; }

.empty{
  text-align: center;
  padding: 60px 20px;
  color: var(--color-muted);
}

/* ===== Footer ===== */
.site-footer{
  border-top: 1px solid var(--color-border);
  padding: 18px 0 24px;
  text-align: center;
  font-size: 13px;
  color: var(--color-muted);
}